If it can't block topics or comments on game pages, I'd call that not working. There's a lot of useless noise on there too.
Viewing post in blocking people in forums is pointless
If that was meant as a reply to the user style solution, it does remove the noise. What it cannot remove is topics, either made on forum or on game pages that do not have comment mode but topic mode. It will also not remove replies on comment mode pages, since those are apparantly not children of the comment. It will however hide all the noise postings, since that is what the style tries to match by.
I fully agree that blocking by making it stand out is rather moot. I puts attention to the thing you want to ignore.